Balance control method for temperature field of utility boiler furnace

Abstract

The invention discloses a balance control method for the temperature field of a utility boiler furnace. The balance control method comprises the following steps: (1) building a furnace section reference coordinate system; (2) respectively arranging temperature measurement devices in the cross direction and the longitudinal direction of the furnace section; (3) acquiring the temperature values of all measurement paths; (4) making a fitted curve between the temperature and the coordinates of the furnace section measurement paths; (5) meshing the furnace section; (6) building a two-dimensional temperature field of the furnace section; (7) calculating the center coordinates of the two-dimensional temperature field of the furnace section; (8) adopting a PID (Proportion Integration Differentiation) controller to achieve control correction calculation of the furnace temperature field; (9) calculating the control corrections of the opening degrees of four corner jet fuel air doors of the boiler; (10) implementing the temperature field balance control method in a DCS (Decentralized Control System). The balance control method has the advantages that pulverized coal is sufficiently burnt out during boiler combustion, the flame center is in the center of the furnace, the temperature field of the furnace is uniformly distributed and the combustion efficiency and stability of the furnace are improved.

Description

Technical field [0001] The invention relates to a furnace temperature field control method of a power station boiler, in particular to a power station boiler furnace temperature field balance control method, which is suitable for four-corner tangential coal-fired units and belongs to the technical field of automatic control. Background technique [0002] The combustion optimization of thermal power units is a difficult problem in the control of power station boilers. The current operation of power station boilers faces the dual pressure of reducing operating costs and reducing nitrogen oxide emissions. The efficient and low-polluting boiler combustion optimization technology has attracted increasing attention. Its goal is Under certain boiler load conditions, the boiler is in a state of high efficiency, low pollution emissions, and safer economic operation by adjusting the operating parameters such as boiler air distribution and coal feeding. Boiler combustion is an extremely com...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problem of uneven furnace temperature field caused by the deflection of the flame center in large-scale power plant boilers adopting the four-corner tangential combustion method, and to provide a simple, convenient, safe, effective, and close to the actual Operational conditions and practical balance control method for furnace temperature field of power plant boilers

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